多道次ECAP挤压对纯铜拉伸行为影响的实验研究

为了解不同道次等通道转角挤压(ECAP)对材料拉伸屈服和硬化的作用,以纯铜棒材试样为研究对象,实验研究了经多道次ECAP后材料的单轴拉伸屈服和硬化行为,并进一步探讨了退火对ECAP后材料力学性能的影响,得到以下结论:①挤压道次相同的情况下,经退火/空冷处理后材料硬化更为充分;②一道次挤压对材料的硬化作用远大于后续道次;③在材料挤压后实施了退火的情形,四道次后的挤压对材料不再有明显的硬化作用。这一研究有助于人们更深入地了解ECAP对材料力学行为的影响。

Experimental investigation on tension hardening behavior of pure copper under multi-pass of ECAP

In order to investigate the influence of multi-pass equal channel angular pressing(ECAP) on the yielding and hardening of a metal,pure copper was used as a target material,and the experimental investigations on the yielding and hardening behavior of the material samples after multi-pass of ECAP were carried out.The analyses of influence on the mechanical characteristics of annealing after ECAP were conducted.The main conclusions are: ① more strengthening can be expected if annealing / air-cold treatment is adopted under the condition that the ECAP pass number is the same;② the strengthening effect of the first pass of ECAP is much greater than that of the subsequent ECAP passes;③ if the annealing treatment is applied,the strengthening effect due to ECAP after four passes will be very small.These results are helpful for people to understand the influence of multi-pass ECAP on the mechanical behavior of metals.